This quantitative study examined the economic viability of using greywater heat recovery (GWHR) systems for barracks, and dining facilities on Army installations. Both training (open bay type) and "1 + 1" type barracks were studied independently due to their configuration differences. This study discusses the technology theory, installation, and expected costs and savings. Theoretical analysis is done using a variety of thermal effectiveness and savings data from independent studies, assumed water usage levels for barracks and dining facilities, and actual fuel cost data. The analytical study determined that it was economically viable, in most cases, to install GWHR systems in training barracks and in dining facilities. In almost every case, both facility types would have short payback periods and have correspondingly high savings to investment ratios. Results for a "1 + 1" barracks configuration show GWHR viability only with high energy costs and a high number of floors. Finally, this study will provide a decision tool regarding the installation of GWHR systems for barracks and dining facilities based on various energy costs and size of facility.
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ERDC/CERL TR-11-20 iii
Executive SummaryThis quantitative study determined that it is economically viable to install greywater heat recovery (GWHR) systems in training barracks and in dining facilities. In almost every case, both facility types would have short payback periods and correspondingly high savings-to-investment ratios. Results show that GWHR systems are most viable for barracks with a "1 + 1" configuration with a higher number of floors (and higher initial energy costs).In 2006, the "Canadian Centre for Housing Technology" conducted a performance evaluation (Zaloum, Gusdorf, and Parekh 2006) of several GWHR technologies to determine effectiveness values and energy savings for five GWHR systems. These performance and savings values were used to determine theoretical energy savings for this study.To determine applicability to Army facilities, energy consumption in barracks was estimated based on facility size, estimated showering water use, and yearly occupation. For dining facilities, water usage was estimated based on facility capacity, estimated number of daily customers, and expected annual operating days. Geographic location was not considered.Results showed that, based on simple payback and savings to investment ratio (SIR) values, it is viable to install GWHR systems in almost all cases.Tables ES1 and ES2 su...
A study was performed by the Energy Branch of the US Army Engineer Research and Development Center, Construction Engineering Research Laboratory, on behalf of the US Army Installation Management Command under the Installation Technology Transition Program. The focus of the study was related to maintainability and operability issues associated with High Performance Sustainable Buildings (HPSBs). This study was conducted primarily based on information gleaned from telephone and web conference discussions with installation Directorate of Public Works personnel including Operation and Maintenance (O&M) Chiefs, energy managers, maintenance supervisors, and maintenance technicians. Experiences with HPSBs varied from installation to installation. For example, some installations had very positive experiences with photovoltaic (PV) arrays while other sites questioned their practicality due to maintainability problems. One site noted that PV technologies are changing so rapidly that procuring spare/repair parts becomes difficult or impossible when vendors discontinue supporting their older technologies or manufacturers go out of business. Based on discussions with the installation O&M personnel, a table of pro and con recommendations for 25 technologies, which are commonly implemented on HPSBs, was prepared and is included in this report.
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